----What are you looking for ?--I’m looking for the pen my father gave me last week.A.

问题补充：

----What are you looking for ?

----I’m looking for the pen my father gave me last week.

A. who

B. which

Cwhose

D. whom

答案：

A. who

(答案→)B. which

C. whose

D. whom

解析：先行词是the pen 指物，且引导词在定语从句中做宾语，用that或which，故选B。